EP4194744A1 - Light module of a motor vehicle headlight and motor vehicle headlight comprising such a light module - Google Patents

Abstract

The invention relates to a light module (10) of a motor vehicle headlight (100), comprising a matrix light source (12) with a multiplicity of several individually controllable individual light sources arranged in a matrix, which each emit more or less light for generating a single point of light depending on their control emit, and- a lens system (14) for imaging the light points generated by the matrix light source (12) on a roadway in front of the motor vehicle to generate a resulting light distribution of the light module (12), the lens system (14) having several in a beam path one behind the other arranged individual lenses (16, 18, 20). It is proposed that the light module (12) has a diaphragm (24) placed in the beam path between the matrix light source (12) and a first individual lens (16) of the lens system (14). comprises, which is designed to have a selective effect on edge areas of the imaged light distribution of the light module (12).

Description

• eine Matrix-Lichtquelle mit einer Vielzahl von matrixartig angeordneten, einzeln ansteuerbaren Einzellichtquellen, die abhängig von ihrer Ansteuerung jeweils mehr oder weniger Licht zum Erzeugen eines einzelnen Lichtpunkts emittieren, und
• ein Linsensystem zum Abbilden der von der Matrix-Lichtquelle erzeugten Lichtpunkte auf einer Fahrbahn vor dem Kraftfahrzeug zur Erzeugung einer resultierenden Lichtverteilung des Lichtmoduls, wobei das Linsensystem mehrere in einem Strahlengang hintereinander angeordnete Einzellinsen aufweist.

The present invention relates to a light module of a motor vehicle headlight, comprising

• a matrix light source with a multiplicity of individually controllable individual light sources which are arranged in a matrix-like manner and which, depending on their control, each emit more or less light for generating a single point of light, and
• a lens system for imaging the points of light generated by the matrix light source on a roadway in front of the motor vehicle to generate a resulting light distribution of the light module, the lens system having a plurality of individual lenses arranged one behind the other in a beam path.

Furthermore, the invention relates to a motor vehicle headlight comprising a housing with a light exit opening closed by a transparent cover plate and a light module of the type mentioned which is arranged in the housing and is used to implement at least part of a resulting light distribution of the Headlight images in a main light exit direction on a roadway in front of the motor vehicle.

Light modules of motor vehicle headlights for generating an adaptive light distribution are known from the prior art, the light modules each having a matrix LED and a projection lens. The matrix LED comprises a large number of individually controllable LEDs arranged above and next to each other or staggered in a matrix-like manner, which, depending on the control, produce more or fewer or brighter or darker points of light (so-called pixels) of the resulting light distribution. According to the current state of the art, a matrix LED typically has between 200 and 20,000 individually controllable pixels.

The projection lens images the points of light emitted by the matrix LED or the light distribution generated on the matrix LED as the resulting light distribution of the light module on a roadway in front of the motor vehicle. The adaptively changeable light distribution can be generated without moving parts of the light module. By specifically controlling the matrix LED, the light distribution can be changed dynamically, e.g Cornering light shines the further into a curve traveled by the motor vehicle, the tighter the curve is), a city light distribution, a country road light distribution, a freeway light distribution, a full high beam, etc. can be changed.

It is also known to construct the projection lens from a plurality of lens elements arranged one behind the other in the direction of light passage. For reasons of weight and cost, an attempt is made to produce the projection lens from as few inexpensive lens elements as possible. However, such systems tend to have a sharp drop in imaging quality at the edge. In general, the image quality at the edge is not so important, but it must not fall below a limit set by the customer (ie the vehicle manufacturer).

Such light modules are, for example, from the DE 10 2019 202 434 A1 and the DE 10 2019 102 475 A1 known. The light modules disclosed there show projection lens systems consisting of three to five individual lenses, some of which are very strongly aspherical, with relatively good imaging properties. However, such individual lenses are expensive and require high precision during production and assembly.

In addition, it is known, for example from Eugene Hecht: Optics, 4th edition, Pearson 2002, that introducing an aperture (so-called apodization) into a lens system can positively influence the optical imaging properties. A light module of a motor vehicle headlight with a lens system that makes use of these properties is, for example DE 10 2020 100 762 A1 known. There, a lens mount of at least one individual lens of the imaging lens system serves as the so-called aperture stop. These lens mounts usually have a round shape. In addition, the shape of the lens mount cannot be freely changed, since this would also change the shape of the individual lens. In this respect, the known light module lacks the necessary flexibility to be able to optimally improve the optical imaging properties.

Proceeding from the described state of the art, the object of the present invention is to use simple means to improve the imaging properties of a lens system in a light module with a matrix light source in the edge regions of the imaged light distribution.

To solve this problem, a light module with the features of claim 1 is proposed. In particular, based on the light module of the type mentioned at the outset, it is proposed that the light module also includes a diaphragm placed in the beam path between the matrix light source and a first individual lens of the lens system, which is designed to have a selective effect on edge regions of the light distribution of the light module shown have.

By introducing a special aperture between the matrix light source and a first individual lens of the imaging lens system, the imaging properties in the edge areas of the resulting Improve light distribution and at the same time the imaging properties and the efficiency in the center (near an optical axis of the light module) do not change. In addition, the diaphragm reduces the scattered light, and it can be integrated inexpensively into a mount for the first individual lens. Another advantage is that the diaphragm allows the diameter of some of the individual lenses that follow in the beam path to be reduced, which saves weight and material costs.

According to an advantageous development of the invention, it is proposed that the diaphragm be designed not to have any influence on an area in the center of the matrix light source. Accordingly, provision can also be made for the diaphragm to be designed to reduce a light intensity in an edge region of the light distribution that is shown. The luminous intensity indicates the luminous flux related to the solid angle.

The diaphragm is particularly preferably designed to reduce the light intensity in a peripheral region of the light distribution shown to 40% to 70% of a value without the diaphragm. In other words, the introduction of the diaphragm into the beam path causes a reduction in the luminous intensity (or the luminous flux) by around 30% to 60% in the edge area of the light distribution shown.

According to a preferred embodiment of the invention, it is proposed that the light module has an aperture stop arranged in the beam path between two individual lenses of the lens system, and that the configuration and dimensions of the stop are selected in such a way that a numerical aperture of the lens system specified by the aperture stop is on an optical axis of the Light module, i.e. in the center of the light distribution shown, is not reduced. The aperture can only be used to reduce the numerical aperture of the lens system in a marginal area of the light distribution shown.

According to a further advantageous development of the invention, it is proposed that the diaphragm comprises a light passage opening which has a central main opening and laterally therefrom secondary openings of smaller surface area, the secondary openings each being in a transition region of the light passage opening into the skip the main opening. The central main opening is larger in area than the individual secondary openings in order to largely avoid a reduction in the numerical aperture on the optical axis of the light module. The side openings are each smaller than the main opening because they reduce the numerical aperture of the lens system in the edge areas of the light distribution shown. In particular, a numerical aperture predetermined by the aperture diaphragm of the light module is reduced by the secondary openings.

It is further proposed that the central main opening has an essentially rectangular shape, with a width (2b) of the main opening being smaller than a height (2c) of the main opening and/or that the lateral secondary openings have an essentially rectangular shape.

According to a preferred embodiment, it is proposed that the central main opening has a height (2c) that is selected in such a way that a diameter of at least one light beam emitted by at least one central individual light source of the matrix light source is not restricted by the aperture . This ensures that a reduction in the numerical aperture on the optical axis of the light module is largely avoided.

Correspondingly, it is proposed that the lateral secondary openings have a height (2d) that is selected in such a way that a diameter of at least one light beam emitted by at least one individual light source arranged in a lateral edge area of the matrix light source passes through the aperture cut off above and below. What is achieved in this way is that the numerical aperture of the lens system is reduced upwards and downwards in the edge regions of the imaged light distribution through the secondary openings.

In this sense, it is proposed that the central main opening has a height (2c) and that the lateral subsidiary openings each have a height (2d) which is approximately 40% to 60% of the height (2c) of the main opening.

Advantageously, the lateral secondary openings are each arranged and formed in the aperture in such a way that a diameter of at least one light bundle, which was emitted by at least one individual light source arranged in a lateral edge area of the matrix light source, passes through the aperture on an edge area of the secondary opening opposite the main opening is cut off. What is achieved in this way is that the numerical aperture of the lens system in the edge regions of the imaged light distribution is reduced to the side outwards through the secondary openings.

In this sense it is proposed that the light passage opening has an overall width (2a) and that the central main opening has a width (2b) which is approximately 40% to 60% of the overall width (2a) of the light passage opening.

According to a preferred embodiment, it is proposed that the height of the light passage opening increases in the transition area from a height (2d) of the secondary openings via an edge area of the light passage opening with an inclined or curved, in particular outwardly curved, course to a height (2c) of the main opening.

In particular, it is proposed that the transition area has a width (2e) which is approximately 5% to 20% of the total width (2a) of the light passage opening, or alternatively that the transition area has a width (2e) of zero.

Figur 1

ein erfindungsgemäßes Lichtmodul in einer bevorzugten Ausführungsform in einer schematischen Seitenansicht;

Figur 2

eine Blende eines erfindungsgemäßen Lichtmoduls in einer bevorzugten Ausführungsform in einer Draufsicht;

Figur 3

eine Matrix-Lichtquelle eines erfindungsgemäßen Lichtmoduls in einer bevorzugten Ausführungsform in einer Draufsicht;

Figur 4

einen Ausschnitt einer Blende eines erfindungsgemäßen Lichtmoduls in einer bevorzugten Ausführungsform in einer Draufsicht;

Figur 5

einen Radius R eines Lichtbündels mindestens einer Einzellichtquelle, die entlang einer quer zu einer optischen Achse des Lichtmoduls und von einem Zentrum A zu einem Randbereich C der Matrix-Lichtquelle verläuft, verschoben wird, mit Blende (gestrichelt) und ohne Blende (durchgezogen);

Figur 6

einen relativen Lichtstrom L eines Lichtbündels mindestens einer Einzellichtquelle, die entlang einer quer zu einer optischen Achse des Lichtmoduls und von einem Zentrum A zu einem Randbereich C der Matrix-Lichtquelle verläuft, verschoben wird, mit Blende (gestrichelt) und ohne Blende (durchgezogen);

Figur 7

ein Testbild in der Form eines leuchtenden Streifens auf der Matrix-Lichtquelle durch die optische Achse des Lichtmoduls ohne Blende;

Figur 8

ein Testbild in der Form eines leuchtenden Streifens auf der Matrix-Lichtquelle durch die optische Achse des Lichtmoduls mit Blende;

Figur 9

eine erste alternative Blendenform in einer Draufsicht;

Figur 10

eine zweite alternative Blendenform in einer Draufsicht; und

Figur 11

einen erfindungsgemäßen Kraftfahrzeugscheinwerfer in einer schematischen Ansicht.

Further features and advantages of the present invention are explained in more detail below with reference to the figures. It is emphasized that individual features shown in the figures can each be essential to the invention on their own, even if this is not expressly mentioned in the description. Furthermore, it would be conceivable that a combination of several features from the figures, also from different figures, could be essential to the invention, even if this combination is not expressly mentioned in the description. Show it:

figure 1

a light module according to the invention in a preferred embodiment in a schematic side view;

figure 2

a panel of a light module according to the invention in a preferred embodiment in a plan view;

figure 3

a matrix light source of a light module according to the invention in a preferred embodiment in a plan view;

figure 4

a section of a panel of a light module according to the invention in a preferred embodiment in a plan view;

figure 5

a radius R of a light bundle of at least one individual light source, which runs along a transverse to an optical axis of the light module and from a center A to an edge region C of the matrix light source, is shifted, with an aperture (dashed) and without an aperture (solid);

figure 6

a relative luminous flux L of a light bundle of at least one individual light source, which runs along a transverse to an optical axis of the light module and from a center A to an edge region C of the matrix light source, is shifted, with an aperture (dashed) and without an aperture (solid);

figure 7

a test pattern in the form of a luminous stripe on the matrix light source through the optical axis of the light module without an aperture;

figure 8

a test pattern in the form of a luminous stripe on the matrix light source through the optical axis of the light module with aperture;

figure 9

a first alternative aperture shape in a plan view;

figure 10

a second alternative aperture shape in a plan view; and

figure 11

a motor vehicle headlight according to the invention in a schematic view.

In figure 1 a light module according to the invention of a motor vehicle headlight is denoted in its entirety by the reference numeral 10 in a preferred embodiment. The light module 10 comprises a matrix light source 12 with a multiplicity of individually controllable individual light sources arranged in a matrix-like manner, which each emit more or less light for generating a single point of light (so-called pixels) depending on their control. The individual light sources can be arranged next to and/or on top of one another or offset relative to one another, so that the term “matrix-like” in the sense of the present invention also includes a series of several individual light sources arranged next to or on top of one another. However, the matrix light source 12 preferably comprises a plurality of individual light sources arranged in rows and columns in the manner of a matrix. In the example shown, the light source 12 is embodied as a matrix LED, which comprises a multiplicity of individual LEDs arranged in a matrix-like manner, each of which can generate a pixel.

Furthermore, the light module 10 includes a lens system 14 for imaging the light points generated by the matrix light source 12 onto a roadway in front of the motor vehicle in order to generate a resulting light distribution of the light module 10. The light distribution can be used to implement a lighting function (e.g. fog light, turning light or cornering light, daytime running lights, position lights, etc.) or at least part of a headlight function (e.g. low beam, high beam, low beam basic light, low beam spotlight, high beam basic light, high beam spotlight, partial high beam, etc.). In the case of a partial high beam, an area of a high beam distribution in which another, for example, preceding or oncoming road user was detected is masked out in order to achieve optimum illumination of the area in front of the vehicle for the driver of the motor vehicle without dazzling the detected road user.

The lens system 14 has a plurality of individual lenses 16, 18, 20 arranged one behind the other in a beam path. In the example shown, the first individual lens 16 is designed as a plano-convex glass lens, the planar side of which represents a light entry surface 16a. In the example, the second individual lens 18 is designed as an achromat (achromatic two-lens lens) in order to reduce the effects of chromatic aberration, if possible even to avoid them entirely. By combining a positive lens 18a and a negative lens 18b made of transparent material with different gradients of refractive index, i.e. with different Abbe numbers, a reversal in the gradient of the focal length can be achieved with the wavelength, and the longitudinal chromatic aberration of the chromatic aberration is corrected. In the example, the third individual lens 20 is formed by a biconvex plastic lens. The lens system 14 or the combination of the individual lenses 16, 18, 20 forms projection optics which project the individual light distributions on the light exit surfaces of the individual light sources (or the light distribution on the matrix light source 12) along an optical axis 22 of the light module 10 in the direction of travel of the motor vehicle as the resulting light distribution of light module 10 on the road.

It is proposed that the light module 10 has an aperture 24 which is located between the first individual lens 16 and the matrix light source 12 . Furthermore, the light module 10 can have a further screen in the form of an aperture screen 26 between two of the individual lenses 16 , 18 , 20 . In the example shown, an aperture stop 26 is arranged between the second individual lens 18 and the third individual lens 20 . The aperture stop 26 limits a numerical aperture of the lens system 14.

The aperture 24 is preferably located close to the matrix light source 12. A distance between the matrix light source 12 and the aperture 24 is preferably in a range of 2 mm and 6 mm. The proximity of the aperture 24 to the matrix light source 12 is important, because only then are the light beams emanating from the matrix light source 12 sufficiently spatially separated from one another, and the aperture 24 can be designed in such a way that they have a selective effect on the edge areas of the mapped light distribution of the light module 10 has. The light module 10 with the aperture 24 is used to improve the modulation transfer function (MTF).

An example of aperture 24 is in figure 2 shown in a plan view (eg against a light exit direction of the light beams). An example of a matrix light source 12 with four individual light sources 12a, 12b, 12c, 12d (aspect ratio 1:4) arranged next to one another in a row is shown in FIG figure 3 shown in a plan view. The optical axis 22 is perpendicular to a center of the point or area A. The light emission surfaces of the individual light sources 12a, 12b, 12c, 12d all have approximately the same dimensions or the same area.

The diaphragm 24 is designed in such a way that it has no influence on the area in the center of the matrix light source 12 or on the light bundles emitted by the individual light sources in this area. The aperture 24 therefore has no influence, for example, on the light from the points or areas A and B of the matrix light source 12 in figure 3 . Furthermore, the screen 24 is designed in such a way that the light intensity at the edge of the matrix light source 12 or the light bundle emitted by this area is reduced to 40% to 70% of the value without the screen 24 . The aperture 24 thus reduces, for example, the luminous intensity of the light from the point or the area C of the matrix light source 12 in figure 3 by 30% to 60%.

The screen 24 comprises a light passage opening 28 which has a central main opening 30 and side openings 32 of smaller surface area, the secondary openings 32 each merging into the main opening 30 in a transition region 34 of the light passage opening 28 . In figure 2 the various areas 30, 32, 34 are delimited from one another by dashed lines for better understanding. It goes without saying that the light passage opening 28 actually does not have these dashed lines. In figure 2 the lateral secondary openings 32 have the same dimensions. However, it would also be conceivable for the secondary openings 32 to have different shapes and/or dimensions.

figure 4 shows the transmission of light bundles 36A, 36B, 36C from the points or areas A, B and C of the matrix light source 12 through the diaphragm 24 or its light passage opening 28. The diameter dA, dB of the light bundles 36A, 36B from the points or Areas A, B is restricted by the aperture stop 26, while the light beam 36C from point or area C is cut off by the stop 24. Without the stop 24, the light beam 36C would have the same diameter dC as the light beams 36A and 36B.

The central main opening 30 has a height h30, which is selected in such a way that a diameter dA, dB of at least one light beam 36A, 36B, which was emitted by at least one central individual light source of the matrix light source 12, which is located, for example, at the point or Area A or B of the matrix light source 12 is not limited by the aperture 24.

Furthermore, the figure 4 It can be seen that the lateral secondary openings 32 preferably have a height h32, which is selected in such a way that a diameter dC of at least one light bundle 36C, which was emitted by at least one individual light source arranged in a lateral edge region C of the matrix light source 12, through the Aperture 24 is cut off at the top and bottom. In addition, the lateral secondary openings 32 can each be arranged and configured in the aperture 24 such that the diameter dC of the at least one light bundle 36C, which was emitted by at least one individual light source arranged in a lateral edge region C of the matrix light source 12, through the aperture 24 is cut off on an edge region 38 of the secondary opening 32 opposite the main opening 30 .

The central main opening 30 preferably has an essentially rectangular shape, with a width b30 of the main opening 30 being smaller than a height h30 of the main opening 30. The side secondary openings 32 preferably also have an essentially rectangular shape.

The light passage opening 28 advantageously has an overall width b28. The width b30 of the central main opening 30 is approximately 40% to 60% of the total width b28 of the light passage opening 28. The height h32 of the secondary openings 32 is preferably approximately 40% to 60% of the height h30 of the central main opening 30.

The height of the light passage opening 28 increases in the transition region 34 from the height h32 of the secondary openings 32 via an upper or lower edge section 40 of the light passage opening 28 with a sloping straight course to the height h30 of the main opening 30 (cf. figure 2 ). Alternatively, it is also conceivable that the height of the light passage opening 28 in the transition region 34 increases from the height h32 of the secondary openings 32 via an upper or lower edge section 40 of the light passage opening 28 with a curved, in particular arc-shaped, progression to the height h30 of the main opening 30 expanded (cf. figure 9 ).

The transition region 34 preferably has a width b34 which is approximately 5% to 20% of the total width b28 of the light passage opening 28 (cf. figure 2 ). Alternatively, it would also be conceivable for the transition area 34 to have a width of zero (cf. figure 10 ). The transition between a height of the main opening 30 and a height of the secondary openings 32 is thus abrupt or stepped. In the example of figure 10 In addition, the main opening 30 of the light passage opening 28 of the panel 24 is limited neither upwards nor downwards. This is possible because the aperture 24 from the figures 2 and 4 the upper and lower edge areas of the main opening 30 do not restrict the central light beams 36A or 36B anyway.

The values for the dimensions (height h30 and width b30) of the main opening 30 are preferably selected in such a way that a numerical aperture of the lens system 14 on the optical axis 22 is not reduced, i.e. has no effect. The numerical aperture of the system is preferably defined by the aperture stop 26 .

figure 5 shows an example of a radius or spot radius R of a light bundle 36 of an individual light source of the matrix light source 12, the individual light source starting from point A along the x-axis (cf. figure 3 ) is moved to the point C and on the y-axis the radius R is plotted between points A and C as a function of the position of the individual light source. The radius R without the aperture 24 is drawn in with a solid line and the radius R with the aperture 24 is drawn in with a dashed line. It can be clearly seen that the radius R (and thus also the diameter dA, dB) of the light beams 36A, 36B from the points or areas A, B is limited at most by the aperture stop 26, but not by the stop 24, while the radius R (and thus also the diameter dC) of the light beam 36C is cut off from the point or area C by the diaphragm 24 (cf. dashed line in area C). Without the aperture 24, the bundle 36C would have a larger diameter, e.g. the same diameter dA; dB as one of the light beams 36A; 36B (see solid line in area C).

figure 6 shows an example of a luminous flux L of a light bundle 36 of an individual light source of the matrix light source 12, the individual light source starting from point A along the x-axis (cf. figure 3 ) is moved to point C and the luminous flux L is plotted on the y-axis as a function of the position of the individual light source between points A and C. The luminous flux L without screen 24 is drawn in with a solid line and the luminous flux L with screen 24 is drawn in with a dashed line. It can be clearly seen that the luminous flux L of the light bundles 36A, 36B from the points or areas A, B through the aperture 24 does not experience any losses, while the relative luminous flux L of the light bundle 36C from the point or area C through the aperture 24 experiences a relative loss (cf. dashed line in area C). Without the stop 24, the beam 36C would have no losses (see solid line in region C).

A reduction in the opening angle or the numerical aperture at the edge of the field (or the light emission surface) of the matrix light source 12 (e.g. around the point or area C) leads to a loss of luminous flux, but at the same time the aberrations ( Image errors) of the lens system 14 reduced. This improvement in image quality is in figure 5 based on the spot radius R (root mean square (RMS) spot radius) as a function of the position of the individual light source on the matrix light source 12 (field position). The diaphragm 24 shows an effect only at the edge of the field (reduction of the radius R) and only there does the Aperture 24 Luminous flux lost. This decrease in luminous flux L is shown schematically in figure 6 shown.

The positive effect of the diaphragm 24 is for a test image (illuminated stripes on the matrix light source 12, through the optical axis 22 and along its long side) based on the Figures 7 and 8 shown where figure 7 the test image without aperture 24 and figure 8 the test image with aperture 24 shows. The dark areas in the test image represent a low (relative) luminous intensity (eg 10 ^-2 ), and the brighter the areas are, the greater the (relative) luminous intensity (eg 10 ³ ). It is easy to see that the aperture 24 causes the luminous stripe to be somewhat sharper at the outer edge area (approximately from ±10). The glowing streak is noticeably wider at the edge of the field, while remaining largely unchanged in the center. The imaging quality is improved essentially in a direction perpendicular to the long side, ie in the y-direction. The test images of Figures 7 and 8 were generated by way of example using a simulated optical system that is constructed similarly to the optical system (the light module 10). figure 1 , and has a numerical aperture of about 0.6.

Alternative forms of the aperture 24 are in the Figures 9 and 10 shown. In the alternative example of figure 9 became the oblique straight edge portion 40 of the transition area 34 from figure 2 replaced by a curved edge portion 40'. The curved edge section 40' is preferably formed by an arc of a circle. From the point of view of the light passage opening 28, the arc of a circle is preferably curved outwards. Of course, it would also be conceivable to provide any other curve instead of a straight edge section 40 or a curved edge section 40'. in the in figure 9 In the case shown, the diaphragm 24 or its light passage opening 28 adapts better to a circular light distribution of the central light beam, for example the light beam B (cf. figure 4 ), at.

Alternatively, the screen 24 can also consist of two partial screens 24a, 24b, which are arranged laterally in the area of the secondary openings 32, and between which the central main opening 30 is formed. Upper and lower edge portions of the main opening 30 are not required because the aperture 24 is close to the optical axis 22, i.e. in the center, should not have any effect. If the imaging properties are only to be improved on the left-hand or right-hand side, it is sufficient to use just one of the partial diaphragms 24a, 24b.

A motor vehicle headlight according to the invention is exemplified in figure 11 1 and designated by the reference numeral 100 in its entirety. The headlight 100 has a housing 102 which is preferably made of a plastic and includes a light exit opening 104 which is closed by a transparent cover plate 106 . The cover plate 38 is made of glass or plastic and can be designed with optically active elements (eg cylindrical lenses, prisms or the like) which scatter the light passing through, in particular in a horizontal direction. However, the cover pane 106 is preferably designed as a so-called clear pane without any optically active elements. The headlight 100 is designed for installation in a corresponding installation opening of a motor vehicle. A light module 10 according to the invention is arranged inside the housing 102 . Several of the light modules 10 can also be arranged in the housing 102 . It is also conceivable that other light modules, in figure 11 symbolically represented by the reference number 108, are arranged inside the housing 102, which are used, for example, to implement a lighting function (e.g. indicator light, cornering light, daytime running light, position light, etc.) or at least part of a headlight function (e.g. low beam/basic light, Low beam spotlight, high beam basic light, high beam spotlight, etc.) are formed. A main light exit direction 110 of the light generated by the light modules 10, 108 runs approximately parallel to a direction of travel of the motor vehicle in which the headlight 100 is mounted. The light exit direction 110 preferably also runs approximately parallel to the optical axis 22 of the light module 10.

In summary, the present invention thus relates to a panel 24 for a so-called micro-LED matrix headlight module 10. The panel 24 is positioned in the vicinity of the matrix light source 12. FIG. The geometry of the aperture or light passage opening 28 is adapted to the shape of the light source 12 or its light emission surface. The geometry of the light passage opening 28 results from the fact that light bundles 36A, 36B emitted by at least one individual light source of the matrix light source 12 which are located in central points or areas A, B of the matrix light source 12, should not be influenced or hardly influenced by the diaphragm 24, and on the other hand light bundles 36C, which were emitted by at least one individual light source of the matrix light source 12, which are located in an edge area C of the matrix light source 12, are to be cut off by the aperture 24 at least in an outer edge area. The invention was described as an example using a matrix light source 12 with an aspect ratio of 1:4 and a correspondingly configured geometry of the diaphragm 24 . Of course, these explanations also apply in a corresponding manner to a matrix light source 12 with a different aspect ratio and a diaphragm 24 with a corresponding geometry.

Claims (15)

Light module (10) of a headlight (100) of a motor vehicle, the light module (10) comprising - a matrix light source (12) with a multiplicity of several individually controllable individual light sources arranged in a matrix-like manner, which emit more or less light depending on their control in order to generate a single point of light, and - A lens system (14) for imaging the light points generated by the matrix light source (12) on a roadway in front of the motor vehicle to generate a resulting light distribution of the light module (12), the lens system (14) having a plurality of individual lenses ( 16, 18, 20) characterized in that the light module (12) further comprises a diaphragm (24) placed in the beam path between the matrix light source (12) and a first individual lens (16) of the lens system (14), which is designed to have a selective effect on edge regions to have the illustrated light distribution of the light module (12). Light module (12) according to Claim 1, characterized in that the screen (24) is designed not to have any influence on light bundles (36A, 36B) from a region (A, B) in the center of the matrix light source (12). Light module (12) according to Claim 1 or 2, characterized in that the screen (24) is designed to reduce a light intensity in an edge region of the light distribution shown compared to a value without the screen (24). Light module (12) according to Claim 3, characterized in that the screen (24) is designed to reduce the light intensity in a peripheral region of the light distribution shown to 40% to 70% of a value without the screen (24). Light module (12) according to one of the preceding claims, characterized in that the light module (12) has an aperture stop (26) arranged in the beam path between two individual lenses (16, 18, 20) of the lens system (14), and that the design and dimensions of the diaphragm (24) are selected in such a way that a numerical aperture of the lens system (14) predetermined by the aperture diaphragm (26) is not reduced on an optical axis (22) of the light module (12). Light module (12) according to one of the preceding claims, characterized in that the screen (24) comprises a light passage opening (28) which has a central main opening (30) and laterally therefrom side openings (32) which are smaller in terms of area, the side openings (32) merge into the main opening (30) in each case in a transition region (34) of the light passage opening (28). Light module (12) according to Claim 6, characterized in that the central main opening (30) has a height (h30) which is selected in such a way that a diameter (dA, dB) of at least one light beam (36A, 36B) that at least one central individual light source of the matrix light source (12) was emitted, is not limited by the aperture (24). Light module (12) according to Claim 6 or 7, characterized in that the lateral secondary openings (32) have a height (h32) which is selected in such a way that a diameter (dC) of at least one light beam (36C) that is provided by at least one was emitted in a lateral edge area (C) of the matrix light source (12) arranged individual light source, is cut off at the top and bottom by the aperture (24). Light module (12) according to one of Claims 6 to 8, characterized in that the lateral secondary openings (32) are each arranged and formed in the screen (24) in such a way that a diameter (dC) of at least one light bundle (36C) that was emitted by at least one individual light source arranged in a lateral edge area (C) of the matrix light source (12), through the diaphragm (24) is cut off on an edge region (38) of the secondary opening (32) opposite the main opening (30). Light module (12) according to one of Claims 6 to 9, characterized in that the central main opening (30) has a substantially rectangular shape, with a width (b30) of the main opening (30) being smaller than a height (h30) of the main opening (30) and/or that the lateral auxiliary openings (32) have a substantially rectangular shape. Light module (12) according to one of Claims 6 to 10, characterized in that the light passage opening (28) has an overall width (b28) and that the central main opening (30) has a width (b30), the width (b30) of the main opening (30) is approximately 40% to 60% of the total width (b28) of the light passage opening (28). Light module (12) according to one of Claims 6 to 11, characterized in that the central main opening (30) has a height (h30) and that the lateral secondary openings (32) each have a height (h32), the height (h32) of the Secondary openings (32) is about 40% to 60% of the height (h30) of the main opening (30). Light module (12) according to one of Claims 6 to 12, characterized in that the height of the light passage opening (28) in the transition region (34) extends from a height (h32) of the secondary openings (32) over an edge region (40) of the light passage opening ( 28) extended to a height (h30) of the main opening (30) with an inclined or curved course, in particular one that is curved outwards. Light module (12) according to one of Claims 6 to 13, characterized in that the transition area (34) has a width (b34) which is approximately 5% to 20% of a total width (b28) of the light passage opening (28) or that the transition area (34) has a width (b34) of zero. Headlight (100) of a motor vehicle, comprising a housing (102) with a closed by a transparent cover plate (106). Light exit opening (104) and a light module (10) arranged in the housing (102) according to one of the preceding claims, which projects light in a main light exit direction (110) onto a roadway in order to implement at least part of a resulting light distribution of the headlight (100). depicts the motor vehicle.

Images